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Insects Carolina Mantis Mayfly I l l i n o i s Insects Carolina mantis mayfly elephant stag beetle widow skimmer ichneumon wasp click beetle black locust borer birdwing grasshopper large milkweed bug (adults and nymphs) mantisfly walking stick lady beetle stink bug crane fly stonefly (nymph) horse fly wheel bug bot fly prairie cicada leafhopper robber fly katydid alderfly syrphid fly Order Ephemeroptera mayfly Species List Order Coleoptera black locust borer click beetle This poster was made possible by: nsects and their relatives (arthropods) make up nearly 80 percent of the known animal species. Scientists elephant stag beetle lady beetle Illinois Department of Natural Resources Order Plecoptera stonefly currently estimate that 5 to 15 million species of insects exist. In contrast, 5,000 species of mammals are Order Orthoptera birdwing grasshopper Carolina mantis Division of Education found on our planet. In Illinois, we have more than 20,000 species of insects, and many more likely katydid Illinois Natural History Survey I Order Hemiptera large milkweed bug Illinois State Museum occur, as yet undetected in our state! The scientific study of insects is known as entomology. Entomologists stink bug wheel bug Order Diptera bot fly study insects for many reasons, including their incredible number of species and their wide variety of sizes, crane fly horse fly colors, shapes, and lifestyles. The 24 species depicted on this poster were selected by Michael R. Jeffords of robber fly syrphid fly Order Homoptera leafhopper the Illinois Department of Natural Resources, Illinois Natural History Survey, to represent the variety of prairie cicada Order Phasmida walking stick insects occurring in our state. Order Neuroptera mantisfly Order Odonata widow skimmer Photographs © Order Megaloptera alderfly Text: Michael R. Jeffords, IDNR, Illinois Natural History Survey Michael R. Jeffords Order Hymenoptera ichneumon wasp What Is An Insect? Conservation Glossary abdomen the most posterior of the insect’s three body divisions Insects are arthropods. As such, they While insects in Illinois appear to be doing quite well, very arthropod an invertebrate, such as an insect, crustacean, arachnid, or have paired, jointed legs, a segmented little information is available about them compared to research myriapod, with a segmented external covering and jointed limbs body, and an external covering, the on other organisms, such as plants or birds. As of 2004, five insects chitin a hard organic compound that makes up the exoskeleton exoskeleton. The exoskeleton provides are on the threatened or endangered list for Illinois. The insects are complete metamorphosis a change in form in which the stages of development are egg, attachment points for all internal larva, pupa, and adult structures. Insects have several traits that three species of prairie-inhabiting skippers (butterflies), a noctuid compound eye an eye composed of many individual light-receptive parts, each separate them from the other arthropods, moth, and the Hine’s emerald dragonfly. All are on the threatened with a lens however, including the presence of three or endangered list because of habitat destruction. Only six species entomology/entomologist the study of insects/person who studies insects body divisions and six legs. of insects are known to be extirpated from Illinois, with a single extirpated completely eliminated from a place; exterminated An insect's body is composed of species, a chewing louse once found only on the passenger pigeon forb a herbaceous plant that is not a grass three main parts: the head, thorax, and (Ectopistes migratorius), being globally extinct. The pigeon became herbivore an organism that eats plants abdomen (see diagram). The head extinct, taking the louse with it! Many more insects likely should host an organism from which a parasite receives nutrition contains most of the sensory structures, be listed as threatened or endangered, but we have no information incomplete (simple) metamorphosis a change in form in which the stages of insect development are such as the eyes, antennae, and about them. Overall, Illinois probably has more species of insects egg, nymph, and adult mouthparts. Mouthparts differ in size larva/larval the immature insect stage that comes after egg and before pupa and shape, depending upon their now than 300 years ago. Why? Because human activities have during complete metamorphosis function. Some insects, for example, brought in many species from other countries and other parts of mandible a jaw that moves from side to side have piercing-and-sucking mouthparts the United States. Many of these metamorphosis a change in form for obtaining fluids from plants or species are very familiar as mimic/mimicry to imitate or closely resemble another living thing/practice animals. Other insects have chewing they have become some of our of mimicking mouthparts for eating prey or plant parts. worst pest species: gypsy moth, molt/molting to shed the skin or exoskeleton Still others have sponging mouthparts Asian long-horned beetle, nectar a sweet secretion from a plant for absorbing fluids and other substances. Chinese soybean aphid, European nymph an immature form of an insect; the stage between egg and adult in The middle part of the body is the corn borer, and Japanese beetle. incomplete metamorphosis thorax. It houses the locomotor organic characteristic of or derived from living things structures: three pairs of legs, and in ovipositor a structure through which the female insect lays eggs many insects, one or two pairs of wings. predator/predaceous animal that feeds on other animals/feeding on other animals The abdomen contains the organs used pupate leave the larval stage and enter the pupa stage in mating and egg laying, digestion, simple eye/ocellus/ocelli (pl.) a type of invertebrate eye that is used to detect light and breathing. thorax the middle body division of an insect, which bears the legs and wings Insect Growth and Development Insect Facts All insects are covered by an exoskeleton. This exoskeleton is made of chitin (KITE-n), a very hard substance. Because the exoskeleton is rigid and strong, it protects the insect against the elements and against its enemies. The exoskeleton is also the main support for the insect's body and the base for muscle attachment and movement. Although the rigidity of the exoskeleton is beneficial to the insect, it also forms an unexpandable prison. If the insect is to grow, it must cast off its old exoskeleton. Before the old exoskeleton is shed, a newer and softer one forms just underneath the old one. When the old exoskeleton splits, the insect climbs out and expands to its The Illinois Department of Natural Resources’ Illinois Natural History Survey new size while the new exoskeleton is still soft and flexible. The new exoskeleton soon hardens and is again effective protection. This process of shedding and replacing the exoskeleton is called molting. has one of the largest and most important insect collections in the world, with Each time an insect molts, visible changes occur. This growth process is called metamorphosis. The changes in the insect's body may be slight, and the feeding habits of the young insect and the adult may be similar. more than 7 million specimens! When that is the case, the insect is said to undergo incomplete metamorphosis, with egg, nymph, and adult stages. The development of a grasshopper is an example of incomplete metamorphosis. As some insects develop, however, they undergo great changes both externally and internally. Major changes can also occur in feeding habits. These insects, like the June beetle and house fly, are said to undergo complete metamorphosis. In The largest insect in Illinois is the cecropia moth, with a wingspan of about complete metamorphosis, development occurs through egg, larva, pupa, and adult stages. For example, the house fly egg hatches to a larval form, known as a maggot. The maggot eats almost continuously and molts several 6 inches. times. All growth occurs during this stage. Then the maggot molts to the pupal stage, during which great cellular changes occur. The adult fly emerges from the pupa, finds a mate, and reproduces. There are at least three times as many species of insects as there are species of all other animals combined. A British entomologist estimated that 1,000,000,000,000,000 (a quadrillion) insects are alive at every instant. Insects outnumber people by at least a million to one, and these million insects together weigh 20 times as much as an average human. Why Are Insects So Successful? Insects range in size from about 1/100 of an inch to 13 inches in length, and from 1/50 of an inch to nearly 12 inches in wingspread. Most insects have two kinds of eyes: two or three simple eyes (ocelli) located More than one million living insect species are named, and countless more unnamed species exist. Why have insects proved to be so successful? One reason is their small size, which lets them occupy habitats too tiny for on the upper part of the head; and a pair of compound eyes on the side of other animals. In addition, their size allows them to survive and reproduce on small amounts of food. Another reason for their success is their short life cycle. An insect can utilize habitats or food resources that are available the head. for only a brief time. The success of insects also depends upon their ability to move from unfavorable sites to more favorable sites, often by flying. In addition, insects have a large potential for reproduction: one female gypsy moth, for example, can lay 1,000 eggs; a queen bee can lay 2,000 eggs a day, 365 days a year, for many years. With these adaptations for survival and reproduction, insects are assured a prominent place on earth. If humans had the ability to kill all insects and were foolish enough to do so, the Insects play crucial roles in the environment.
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